It used to be challenging to be a vegetarian or vegan as people who chose to
adopt such diet have religious beliefs towards tolerance of all
living beings. The earliest history record was dated around the 7th century in
Indus Valley Civilization.

There have been plenty of statistics and studies showing the relationship
between vegetarian diet and longevity.
Patients are sometimes advised to adhere to a vegetarian diet to help reduce the
health risks like high blood pressure, heart disease, and control of cholesterol
levels. In modern days, animal rights are another reason why
people choose a vegan diet.